This is an open-loop thermosyphon solar water heater. Water circulates directly through the tank and the collector, so this is direct and quick. This system is very stable and with reliable performance. And it's the most economical and easy system among a
Solar water heater with assistant tankit is the most economic product. It is very popular in Africa, Asia and China. It is the first generation product in vacuum tubes solar field. It is also approved in Europe. So do not dbout the quality of it.